U.S. patent application number 12/327949 was filed with the patent office on 2009-06-11 for method for charging a battery of a hybrid vehicle at rest.
This patent application is currently assigned to ZF Friedrichshafen AG. Invention is credited to Notker Amann, Stefan Wallner.
Application Number | 20090149290 12/327949 |
Document ID | / |
Family ID | 40620950 |
Filed Date | 2009-06-11 |
United States Patent
Application |
20090149290 |
Kind Code |
A1 |
Wallner; Stefan ; et
al. |
June 11, 2009 |
METHOD FOR CHARGING A BATTERY OF A HYBRID VEHICLE AT REST
Abstract
A method for charging a battery connected to an electric machine
in a vehicle having an electrodynamic drive system including an
electric machine and a planetary gearset. A crankshaft of the
internal combustion engine is connected with a first element of the
planetary gearset, the electric machine with a second element of
the planetary gearset and a transmission input shaft with another
element of the planetary gearset. A friction clutch detachably
connects two elements of the planetary gearset, such that when the
clutch is engaged, the planetary gearset runs in locked operation
and when the internal combustion engine is running and the clutch
is disengaged, a gear in the transmission is engaged to charge the
battery via the combustion engine. The combustion engine drives the
rotor of the electric machine with the transmission ratio of the
planetary gearset.
Inventors: |
Wallner; Stefan; (Mattsee,
DE) ; Amann; Notker; (Friedrichshafen, DE) |
Correspondence
Address: |
DAVIS & BUJOLD, P.L.L.C.
112 PLEASANT STREET
CONCORD
NH
03301
US
|
Assignee: |
ZF Friedrichshafen AG
Friedrichshafen
DE
|
Family ID: |
40620950 |
Appl. No.: |
12/327949 |
Filed: |
December 4, 2008 |
Current U.S.
Class: |
475/149 |
Current CPC
Class: |
Y02T 10/70 20130101;
B60W 10/08 20130101; B60W 20/00 20130101; B60W 30/18136 20130101;
Y02T 10/7077 20130101; B60L 50/15 20190201; B60K 6/445 20130101;
Y02T 10/62 20130101; B60W 10/26 20130101; Y02T 10/6221 20130101;
Y02T 10/7094 20130101; B60K 6/48 20130101; Y02T 10/6286 20130101;
Y02T 10/7005 20130101; Y02T 10/7072 20130101; B60W 10/196 20130101;
Y02T 10/6239 20130101; B60W 20/10 20130101; B60L 53/00 20190201;
B60W 10/02 20130101; Y02T 90/14 20130101; B60W 10/06 20130101 |
Class at
Publication: |
475/149 |
International
Class: |
F16H 57/08 20060101
F16H057/08 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 5, 2007 |
DE |
10 2007 055 708.8 |
Claims
1-2. (canceled)
3. A method for charging a battery connected to an electric machine
in a parallel hybrid vehicle at rest which comprises an
electrodynamic drive system (1) including the electric machine (2)
and a planetary gearset (3), a crankshaft (4) of an internal
combustion engine of the vehicle being connected with a first
element (5) of the planetary gearset (3), the electric machine (2)
being connected with a second element (6) of the planetary gearset
(3) and a transmission input shaft (7) being connected with a third
element (8) of the planetary gearset (3), and a friction clutch
(9), which connects two of the first element (5), the second
element (6) and the third element (8) of the planetary gearset (3)
in a releasable manner such that, when the friction clutch (9) is
engaged, the planetary gearset (3) operates in blocked condition,
the method comprising the steps of: disengaging the friction clutch
(9) of the planetary gearset (3) while the internal combustion
engine of the vehicle is operating; and engaging a gear of the
transmission (10) such that the combustion engine drives a rotor
(11) of the electric machine (2) with a transmission ratio of the
planetary gearset (3) and charges the battery.
4. The method according to claim 3, further comprising the steps
of: connecting the crankshaft (4) of the combustion engine, via a
damping device (12), to the first element which is a ring gear (5)
of the planetary gearset (3); connecting the rotor (11) of the
electric machine (2) to the second element which is a sun gear (6)
of the planetary gearset (3); connecting the transmission input
shaft (7) to the third element which is a carrier (8) of the
planetary gearset (3); and connecting the sun gear (6) and the
carrier (8) of the planetary gearset (3) with the friction clutch
(9) in a releasable manner.
5. A method for charging a battery coupled to an electric machine
(2) in a parallel hybrid vehicle having an electrodynamic drive
system (1), when an internal combustion engine is operating and the
vehicle is at rest, the method comprising the steps of: coupling a
crankshaft (4) of the internal combustion engine to a ring gear (5)
of the planetary gearset (3) via a damping device (12); coupling a
rotor (11) of the electric machine (2) to a sun gear (6) of the
planetary gearset (3); coupling a carder (8) of the planetary
gearset (3) to an input shaft (7) of a transmission (10) of the
vehicle; enabling releasable coupling between the sun gear (6) of
the planetary gearset (3) and the carrier (8) of the planetary
gearset (3), via a clutch (9), such that when the clutch (9) is
engaged, the sun gear (6) of the planetary gearset (3) and the
carrier (8) of the planetary gearset (3) are fixed with respect to
each other; and driving the rotor (11) of the electric machine (2)
with the internal combustion engine at a transmission ratio of the
planetary gearset (3) by disengaging the clutch (9) and engaging a
gear in the transmission (10) of the vehicle to charge the battery
coupled to the electric machine (2).
6. A method for charging a battery connected to an electric machine
in a parallel hybrid vehicle at rest which comprises an
electrodynamic drive system (1) including the electric machine (2)
and a planetary gearset (3), a crankshaft (4) of an internal
combustion engine of the vehicle being connected with a ring gear
(5) of the planetary gearset (3), the electric machine (2) being
connected with a sun gear (6) of the planetary gearset (3) and a
transmission input shaft (7) being connected with a carrier (8) of
the planetary gearset (3), and a friction clutch (9), which
connects two of the ring gear (5), the sun gear (6) and the carrier
(8) of the planetary gearset (3) in a releasable manner such that,
when the friction clutch (9) is engaged, the planetary gearset (3)
operates in blocked condition, the method comprising the steps of:
disengaging the friction clutch (9) of the planetary gearset (3)
while the internal combustion engine of the vehicle is operating;
and engaging a gear of the transmission (10) such that the
combustion engine drives a rotor (11) of the electric machine (2)
with a transmission ratio of the planetary gearset (3) and charges
the battery.
Description
[0001] This application claims priority from German Application
Serial No. 10 2007 055 708.8 filed Dec. 5, 2008.
FIELD OF THE INVENTION
[0002] The present invention relates to a method for charging the
battery connected to the electric machine of a vehicle having an
electrodynamic drive system, in particular a parallel hybrid
vehicle at rest.
BACKGROUND OF THE INVENTION
[0003] From the prior art, hybrid vehicles that comprise a hybrid
transmission are known. In addition to the internal combustion
engine, they comprise an electric motor or electric machine. In
serial hybrid vehicles, a generator is powered by the internal
combustion engine and the generator supplies electrical energy to
the electric motor, which drives the wheels. Furthermore, parallel
hybrid vehicles are known, in which a summation of the torques of
the internal combustion engine and at least one electric machine
that can be connected with the internal combustion engine takes
place. In such cases, the electric machines can be connected to the
belt drive or to the crankshaft of the internal combustion engine.
The torques produced by the internal combustion engine and/or the
at least one electric machine are transmitted to the driven axle by
a downstream transmission unit.
[0004] From the prior art, in the case of parallel hybrid vehicles,
it is known to couple the electric machine not directly between the
internal combustion engine and the transmission, but rather via a
single-stage planetary gearset in a releasable manner between the
combustion engine and the transmission, where an electro-dynamic
drive system is formed.
[0005] For example, U.S. Pat. No. 6,805,648 B1 by the present
Applicant, whose disclosure relating to the electrodynamic drive
system is incorporated by reference into content of the present
description and describes an electrodynamic drive system for a
vehicle which comprises, between a drive engine and a main
transmission, a planetary gearset that serves as a summation gear
system and includes the three elements: a sun gear, a ring gear and
a planetary gear carrier. In this, a first element of the planetary
gearset is connected to the main transmission, a second element to
the drive engine and a third element to at least one electric motor
so that a wear-free starting element for the vehicle is formed.
[0006] U.S. Pat. No. 6,817,327 B2 by the present Applicant
describes a method for starting an internal combustion engine of a
vehicle equipped with an electrodynamic drive system, which
comprises an electric machine and a planetary gearset between the
internal combustion engine and a main transmission with an input
shaft.
[0007] In this case the ring gear of the planetary gearset is
connected in a rotationally fixed manner to the crankshaft of the
internal combustion engine via a damping device and the carrier of
the planetary gearset can be releasably connected to the rotor of
the electric machine, which is connected in a rotationally fixed
manner with the sun gear of the planetary gearset, by way of a
friction clutch. The friction clutch serves as a bridging clutch of
the planetary gearset since, when the friction clutch is engaged,
the planetary gearset is locked.
[0008] In addition, the carrier of the planetary gearset is
connected to the input shaft of the main transmission and the input
shaft can be releasably coupled, via a brake, to a transmission
housing.
[0009] Usually, in vehicles having an electrodynamic drive system,
for example parallel hybrid vehicles, when the vehicle is at rest
with its internal combustion engine running, the electrical energy
for the main electrical system, for secondary consumers, etc., is
produced by the electric machine.
[0010] The purpose of the present invention is to Indicate a method
for charging a battery connected to the electric machine in a
vehicle comprising an electrodynamic drive system, in particular a
parallel hybrid vehicle at rest. The implementation of which can
quickly charge the battery.
SUMMARY OF THE INVENTION
[0011] Accordingly, a method is proposed for charging a battery
connected to the electric machine in a vehicle comprising an
electrodynamic drive system, in particular a parallel hybrid
vehicle at rest, such that when the combustion engine of the
vehicle is running, the bridging clutch of the planetary gearset is
disengaged, a gear in the transmission of the vehicle is engaged
and the battery is charged by the combustion engine.
[0012] In this case, the electrodynamic drive system comprises an
electric machine and a planetary gearset that serves as a summation
gear system, such that the crankshaft of the internal combustion
engine of the vehicle is connected with a first element of the
planetary gearset, the electric machine with a second element of
the planetary gearset and the transmission input shaft with a
further element of the planetary gearset. In addition, a friction
clutch that serves as a bridging clutch is provided, which connects
two elements of the planetary gearset to one another in a
releasable manner, such that in the engaged condition of the
clutch, the planetary gearset runs in locked operation.
[0013] Thanks to the concept, by way of the transmission ratio of
the planetary gearset (the planetary gearset is not locked) the
speed of the electric machine is raised in a controlled manner
while the combustion engine is running at very low speeds so that
the overall efficiency is increased advantageously.
BRIEF DESCRIPTION OF THE DRAWING
[0014] The invention will now be described, by way of example, with
reference to the accompanying drawing in which:
[0015] The sole FIGURE shows an electrodynamic drive system and its
arrangement.
DETAILED DESCRIPTION OF THE INVENTION
[0016] An electrodynamic drive system 1, shown in sole FIGURE, is
arranged between the internal combustion engine (not shown) of the
vehicle and a vehicle's transmission 10, which is preferably made
as a change-speed transmission. The electrodynamic drive system 1
comprises an electric machine 2 and a planetary gearset 3 that
serves as a summation gear system.
[0017] As can be seen from the FIGURE, a crankshaft 4 of the
vehicle's combustion engine is connected, via a damping device 12,
to a ring gear 5 of the planetary gearset 3, a rotor 11 of the
electric machine 2 is connected to a sun gear 6 of the planetary
gearset 3 and a transmission input shaft 7 is connected to a
carrier 8 of the planetary gearset 3. In addition, a friction
clutch 9 that serves as a bridging clutch is provided, which
connects the sun gear 6 and the carrier 8 of the planetary gearset
3 releasably with one another so that when this clutch 9 is engaged
the planetary gearset 3 runs in locked operation.
[0018] According to the invention, when the vehicle's combustion
engine is running and the bridging clutch 9 of the planetary
gearset 3 is disengaged, a gear is engaged in the transmission 10,
where the combustion engine drives the rotor 11 of the electric
machine 2 with the transmission ratio of the planetary gearset so
that the battery connected to the electric machine 2 is
charged.
[0019] Thus, the speed of the electric machine 2 is raised while
the combustion engine is operated at very low speeds so that the
overall efficiency is advantageously increased. In this case, the
kinetic energy, produced by the combustion engine when it is
idling, is put to good use.
REFERENCE NUMERALS
[0020] 1 electrodynamic drive system [0021] 2 electric machine
[0022] 3 planetary gearset [0023] 4 crankshaft [0024] 5 ring gear
[0025] 6 sun gear [0026] 7 transmission input shaft [0027] 8
carrier [0028] 9 friction clutch [0029] 10 transmission [0030] 11
rotor [0031] 12 damping device
* * * * *